Piano, you're way ahead of me. I've spent hours filling a spreadsheet with numbers and still haven't filled one cell! I think I know the 13 possible values of E, L, T but I'm not spending any more time on it today. Very tedious. I much prefer numericals with a clear logical path from the start and the minimum of trial and error.
I'm not asking for help, just having a moan. I don't think there's been one puzzle this year that has been on the easy side of average. Several have been harder, and this one looks like the equivalent of a Magpie E.